Is it possible to resize faces/edges/vertices to a specific size?
Yeah, unfortunately, I think the best you can do for now is to enable face and edge measurements under overlays. It's only a display - it doesn't let you input any numbers directly, but at least it lets you see dimensions as you scale, and transform and whatnot. If an add-on for this type of thing does exist, I would love if someone could point it out. Until then, I think this is what we're stuck with.